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Final basic annual weight


PERWEIGHT is a 12-digit numeric variable.


PERWEIGHT is an IPUMS NHIS-constructed variable based on the Final Annual Weight in the original NHIS public use files. This weight should be used for many analyses at the person level, particularly with variables for which information was collected about all family members. PERWEIGHT represents the inverse probability of selection into the sample, adjusted for non-response with post-stratification adjustments for age, race/ethnicity, and sex using the Census Bureau's population control totals. For each year, the sum of these weights is equal to that year's civilian, non-institutionalized U.S. population.

There are instances, however, when the researcher should use a different person-level weight, particularly with supplements where a random adult or child family member was selected for questioning. For example, researchers analyzing variables from the sample adult/sample child supplements from 1997 forward should use SAMPWEIGHT rather than PERWEIGHT.

Users should review the documentation for extracted variables--most notably the "Weights" section toward the top of each variable description--to ascertain which weight is the appropriate choice for a given survey year. See the User Notes on the use of sampling weights for additional information.


This variable is comparable for all years, with the stipulation that each year's PERWEIGHT values are adjusted for contemporaneous Census population estimates.


  • 1963-2018: All persons.


  • 1963-2018